﻿//The MIT License

//Copyright (c) 2009 Lluis Sanchez, Nick Darnell

//Permission is hereby granted, free of charge, to any person obtaining a copy
//of this software and associated documentation files (the "Software"), to deal
//in the Software without restriction, including without limitation the rights
//to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//copies of the Software, and to permit persons to whom the Software is
//furnished to do so, subject to the following conditions:

//The above copyright notice and this permission notice shall be included in
//all copies or substantial portions of the Software.

//THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//THE SOFTWARE.

using System.Reflection.Emit;

namespace Polymorph
{
    /// <summary>
    /// The <see cref="CodeFault"/> class represents a fault block.  Fault
    /// blocks are similar to finally blocks, except that they are only called
    /// when an exception occurs.
    /// </summary>
    public class CodeFault : CodeStatement, IExceptionBlock
    {
        private CodeBlock m_faultBlock;

        /// <summary>
        /// Initializes a new instance of <see cref="CodeFault"/>.
        /// </summary>
        public CodeFault()
        {
        }

        /// <summary>
        /// Gets or sets the fault block.
        /// </summary>
        public CodeBlock FaultBlock
        {
            get { return m_faultBlock; }
            set { m_faultBlock = value; }
        }

        // <summary>
        /// Generates the IL code for the fault block.
        /// </summary>
        /// <param name="gen">The IL generator to use.</param>
        public override void Generate(ILGenerator gen)
        {
            gen.BeginFaultBlock();
            m_faultBlock.Generate(gen);
        }

        /// <summary>
        /// Prints the code for a fault block in a human readable format.
        /// </summary>
        /// <param name="cw">The code writer to use.</param>
        public override void PrintCode(CodeWriter cw)
        {
            cw.Write("fault");
            cw.EndLine();
            cw.WriteLine("{");
            cw.Indent();
            if (m_faultBlock != null)
            {
                m_faultBlock.PrintCode(cw);
            }
            cw.Unindent();
            cw.BeginLine();
            cw.Write("}");
        }
    }
}